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O-linked mucin-type glycoproteins in normal and malignant colon mucosa: Lack of T-antigen expression and accumulation of tn and sialosyl-Tn antigens in carcinomas

Corresponding Author

Torben F. Ørntoft

The Danish Cancer Society, Department of Experimental Clinical Oncology, Aarhus C, Denmark

Department of Experimental Clinical Oncology, Radiumstationen, DK-8000 Aarhus C, DenmarkSearch for more papers by this author

Niels Harving,

Niels Harving

The Danish Cancer Society, Department of Experimental Clinical Oncology, Aarhus C, Denmark

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Niels C. Langkilde,

Niels C. Langkilde

The Danish Cancer Society, Department of Experimental Clinical Oncology, Aarhus C, Denmark

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Torben F. Ørntoft,

Corresponding Author

Torben F. Ørntoft

The Danish Cancer Society, Department of Experimental Clinical Oncology, Aarhus C, Denmark

Department of Experimental Clinical Oncology, Radiumstationen, DK-8000 Aarhus C, DenmarkSearch for more papers by this author

Niels Harving,

Niels Harving

The Danish Cancer Society, Department of Experimental Clinical Oncology, Aarhus C, Denmark

Search for more papers by this author

Niels C. Langkilde,

Niels C. Langkilde

The Danish Cancer Society, Department of Experimental Clinical Oncology, Aarhus C, Denmark

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First published: 15 April 1990

https://doi.org/10.1002/ijc.2910450416

Citations: 91

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Abstract

The expression of carbohydrate core-structures on O-linked glycoproteins was examined in fetal (n = 6), infantile (n = 2), normal adult (n = 15), and malignant (n = 22) colorectal tissue by means of monoclonal antibodies (MAbs) specific for Tn (Ga1NAcα1-O-R), sialosyl-Tn (NeuAcα2-6Ga1NAcα1-O-R), and T (Ga1β-3GalNAcα1-O-R) antigens. Immunolabelling of solubilized malignant tissue, separated by SDS-PAGE, showed expression of Tn and sialosyl-Tn antigens on 3 molecules of similar mw (230, 210, and 170 kDa), whereas no T antigens could be detected. Immunohistochemical techniques showed that fetal colon mucosa expressed Tn antigens but no sialosyl-Tn antigens. Infantile colon mucosa, however, expressed Tn as well as sialosyl-Tn antigens, and normal adult colon mucosa cells expressed no Tn antigens but sialosyl-Tn in 2 out of 6 biopsies from cecum, which indicates occurrence post partum of α-6-NeuAc-transferase. Endothelium in normal adult mucosa showed expression of both Tn and sialosyl-Tn antigens; 82% of carcinoma tissue sections expressed Tn antigens, and 73% expressed sialosyl-Tn antigens in mucin or cytoplasm, or on luminal cell membranes. T antigens could be detected neither in normal mucosa cells at any stage of development, nor in carcinomas. The possibility exists that this could be due to masking of T antigen. Mucin-type blood-group A antigens which contain an internal T-disaccharide were demonstrated in 4 out of 4 A₁ tumors by means of MAb HH5. However, urea-containing SDS-PAGE analysis demonstrated an HH5 binding to molecules different from those binding anti-Tn. In remote morphologically normal and abnormal crypts in colons from carcinoma patients, both Tn and sialosyl-Tn antigens were expressed in secreted mucin in 40% of the cases. The data indicate an expression of O-linked Tn and sialosyl-Tn core structures in fetal and infantile colon and in colorectal carcinomas.

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Volume45, Issue4

15 April 1990

Pages 666-672

O-linked mucin-type glycoproteins in normal and malignant colon mucosa: Lack of T-antigen expression and accumulation of tn and sialosyl-Tn antigens in carcinomas

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O-linked mucin-type glycoproteins in normal and malignant colon mucosa: Lack of T-antigen expression and accumulation of tn and sialosyl-Tn antigens in carcinomas

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